Home / 20,748.43-31,122.51-12,430.81

Finding the Fourth Proportional to 20,748.43, 31,122.51 and 12,430.81

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Solution

The fourth proportional to 20,748.43, 31,122.51 and 12,430.81 is: 18,646.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,748.43 : 31,122.51 = 12,430.81 : x
  2. Step 2: Convert to fraction form
    20,748.43/31,122.51 = 12,430.81/x
  3. Step 3: Cross multiply
    20,748.43x = 31,122.51 × 12,430.81
  4. Step 4: Simplify right side
    20,748.43x = 386,878,008.53
  5. Step 5: Solve for x
    x = 386,878,008.53/20,748.43
  6. Step 6: Final answer
    x = 18,646.13

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.